Do not use Poly Glo. When it goes bad over time.... and it will, it is nearly impossible to get off all the way. Way too many good polishing kits to bring your gelcoat back over outdated poly coatings.
I would 800 grit wet sand the line out and finish with 1500 before buffing it out and waxing. Dish soapy water works great.
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[b]The Moose is Loose !
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